Question 1. (50%) A ventilation system is installed in a factory, of 40000m³ space, which needs 10 fans to convey air ax

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Question 1 50 A Ventilation System Is Installed In A Factory Of 40000m Space Which Needs 10 Fans To Convey Air Ax 1 (59.53 KiB) Viewed 19 times

Question 1. (50%) A ventilation system is installed in a factory, of 40000m³ space, which needs 10 fans to convey air axially via ductwork. Initially, 5.5 air changes an hour is needed to remove waste heat generated by machinery. Later additional machines are added and the required number of air changes per hour increases to 6.5 to maintain the desired air temperature. Given the initial system air flow rate of 200500 m³/hr, power of 5kW/fan at a pressure loss of 40Pa due to ductwork and the rotational speed of the fan of 1000rpm. (a) Give the assumption(s) of fan law. (b) Suggest and explain one type of fan suitable for the required purpose. (c) New rotational speed of fan to provide the increase of flow rate. (d) New pressure of fan for the additional air flow. (e) Determine the total additional power consumption for the fans. (5%) (10%) (10%) (10%) (10%) (f) Comment on the effectiveness of the fans by considering the airflow increase against power increase. (5%)